CVE-2024-40961

Kernel crash via unchecked IPv6 device lookup

Published Jul 12, 2024 · Updated May 12, 2026

NULL pointer dereference in Linux IPv6 routing allows local users to crash affected systems through a crafted route operation. fib6_nh_init passes an in6_dev_get result through gateway validation and later dereferences it without first rejecting NULL. Local access and permission to add an IPv6 route are required, and the documented consequence is a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux IPv6 routing allows local users to crash affected systems through a crafted route operation. fib6_nh_init passes an in6_dev_get result through gateway validation and later dereferences it without first rejecting NULL. Local access and permission to add an IPv6 route are required, and the documented consequence is a kernel crash.

The record

CVE
CVE-2024-40961
Published
Jul 12, 2024
Updated
May 12, 2026
Vendor
Siemens
Product
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 12, 2024CVE publishedPublication date reported by the CVE source.
  2. May 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <*

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Siemens · SIMATIC S7-1500 TM MFP - GNU/Linux subsystemversion=0 <*
The Linux Kernel Organization · Linuxversion=4.17; version=428604fb118facce1309670779a35baf27ad044c <2eab4543a2204092c3a7af81d7d6c506e59a03a6; version=428604fb118facce1309670779a35baf27ad044c <3200ffeec4d59aad5bc9ca75d2c1fae47c0aeade; version=428604fb118facce1309670779a35baf27ad044c <4cdfe813015d5a24586bd0a84fa0fa6eb0a1f668; version=428604fb118facce1309670779a35baf27ad044c <88b9a55e2e35ea846d41f4efdc29d23345bd1aa4; version=428604fb118facce1309670779a35baf27ad044c <ae8d3d39efe366c2198f530e01e4bf07830bf403; version=428604fb118facce1309670779a35baf27ad044c <b6947723c9eabcab58cfb33cdb0a565a6aee6727; version=428604fb118facce1309670779a35baf27ad044c <de5ad4d45cd0128a2a37555f48ab69aa19d78adc
Siemens · SCALANCE XCM/XRM/XCH/XRH-300 familyversion=0 <V3.1
Siemens · RUGGEDCOM RST2428Pversion=0 <V3.1

Published CVSS scores

5.5Siemens ProductCERTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation DoS

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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